Telescopic gun-sight.



No. 677,288. Patented lune 25, |901.

A. SWASEY.

TELESCOPIG GUN SIGHT.

(Application led July 10, 1899.) (No Model.) ZSheeta-Sheet l.

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No. 677,288. Patented June 25,- Ism.

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TELESCDPIG GUN SIGHT.

(Application led July 10, 1899.) (No Model.) 2 `Sheets-Sheet 2.

Niere Sterns SWASEY, OF SAME PLACE.

TELESCOPIC GUN-SIGHT.

SPECIFICATION forming part of Letters Patent No. 677,288, dated June 25, 1901.

Application filed July IO, 1899. Serial No, '723,373- (No model.

To all whom, it may concern.:

Beit known that I, AMBROSE SWASEY, a citizen of the United States, residing at Cleveland, in the county ot Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Telescopic Gun Sights, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The invention is an improvement upon the well-known telescopic gun-sight.

The object of the invention is to simplify and improve the construction,whereby the instrument is rendered more efficient and durable and more easily handled and used.

The invention consists in the construction and combination of parts shown in the drawings and hereinafter` described, and pointed out deinitely in the claims.

In the drawings, Figure lis a right side elevation of a telescopic gun-sight containing n my invention. Fig. 2 is a rear end view thereof. Fig. 3 is a similar view when the eyepiece and the rear end plate of the telescope are removed. Fig. 4 is a sectional View on line 44 of Fig. 3 looking in the direction of the arrow. Fig. 5 is a sectional View on line 5 5 of Fig. 8. Fig. 6 is a plan view with pivot-bearing of the telescope and the housing which contains the elevation-screw in section. Fig. 7 is a sectional view on line 7 7 of Fig. 6.

The telescope C has near its objective end a horizontal cylindrical stud c', which serves as a supporting-pivot, and has its bearing in a horizontal hole in the sight-frameJ. This frame is located wholly upon one side of the telescope and has trunnionsj at its ends for engagement in the supporting-bracket attached to the gun, and it also has between said trunnions an arm j, which is adapted to engage beneath the leveling-screw on the said bracket. The frame is also provided near its rear end with a vertical housingjz, which embraces and furnishes a bearing for the micrometer-screw K. In the front side of this housing is a vertical slot js, through which a worm-gear segment c3 on the side of the telescope projects into engagement with the said micrometer-screw. By turning the micrometer-screw in one direction or the other the telescope is turned about its pivot-stud c', thereby changl ing the elevation of the telescope. The degree of elevation due to this movement is ascertained by means of a graduated scale I on the frame and a Vernier scale M on the telescope. An annular flange j on the frame J surrounds the inner end of the bearing for the pivot-stud, and a similar iiange c4 on the telescope surrounds said bearing-stud at its base. When the parts are assembled, these flanges engage and inclose a recess n, in which is placed atorsionalcoilspringN,the outer ends of which are turned outward. One of said ends enters a uotchj5 in the iiangej4 and the other enters a notch c5in the .flange c4, Whereby this spring acts to prevent any backlash in the actuation of the elevation mechanism.

For giving the deflection two scales are employed, one inside the telescope-that is to say, beyond the eyepiece-and the other outside the telescopc-that is to say, to one side of the eyepiece-and two pointers, both secured to the same laterally-sliding frame A. The interior scale E is a horn-scale, which is fastened in the micrometer-box by means of a clamping-plate e. The horn-scale is shown as graduated to two degrees and thirty minutes on each side of the zero, and the smallest division thereon is three minutes. Within the micrometer-box a transversely-movable sliding frame A is mounted in suitable guides. To it is secured a pointer in the form of a vertical cross-Wire a, Which coperates with this horn-scale to indicate the delection. A horizontal cross-Wire is secured to a frame H, which is adj ustably secured in the micrometer box. It is provided with slots h, through which the fastening-screws pass, whereby this frame may be adjusted so that said horizontal wire will be extended in a truly-horizontal direction across the middle of the ield of vision.

Secured to the frame A is a laterallyex tended pointer a2, which cooperates with the outside scale G. Both pointers a a2, being secured to the frame A, move in unison. The deflection is shown to one looking in the tele-` scope by the position of the vertical pointerwire a with respect to the horn-scale E. The dellection is likewise indicated Without looking in the telescope by means of the scale G and thepointer CL2.

The eyepiece c of the telescope is formed integral'with the cap-plate c6 of the micrometer-box, which is secured to said box by means of screws. This cap-plate is cut away adjacent to the scale G, whereby thc indications of said scale may be read.

The frame A is moved in one direction or other by means of a horizontal deflectionscrew a, secured to the right side of the frame A, and the micrometer-nut D, which screws onto the projecting end of said screw and bears against the side of the micrometerboX. Backlash is overcome by two contractile spiral springs CL3 a3, which are secured at one of their ends to the inner wall of the micrometer-box and at the other to the sliding frame A. The outside' scale G is graduated to degrees and half-degrees, andthe micrometer screw and nut' are accurately cut, sothat one complete turn of the nut moves the sliding frame thirty minutes. Thethree-minute readings to correspond with" the graduations on the horn-scale are obtained from the micrometer-nut. This nut is graduated onits collar with, preferably, two series of'figures, from 0 to 9,l and running in opposite directions,which figures coperate withagraduation-m ark e7on the cap-plate of the micrometer-box. One series of figures gives the correct reading` when the deflection movement isfor firing to the left and the other series forthe contrary movement.

Having. described my invention, what I claim as'new, and desire to secure by Letters Patent, isf 1. VIn a telescopic gun-sight, the combination' of a telescope having, on one side, a laterally-projecting pivot-stud, and-an annular flange'surrounding the said studA at the base thereof,Withasupporting-framehavingahori- Zontal bearing for said stud, and an annular flange surrounding said bearing, said flanges having each'a notch, a torsion coil-spring surroundingl said stud and lying in the recess formed by said flanges and having its ends tur'ned'out'w-ard and inserted insaid notches respectively, means for moving the telescope having trunnions at its ends, and having on lthe side which is farthest from the telescope ta lateral projecting arm, and having on the ,side which is adjacent to the telescope, a horizontal bearing for said stud and a vertical housing in which-is a vertical slot through which said worm-wheel segment projects, and a micrometerscrew which is inclosedl and mounted in said housing-and engaging with `said worm'- wheel segment, substantially as specified'.

3. In a telescopicI gun-sight, a deflection 'find'er consisting of a body, aiixed-frame'carrying a horizontal wire, aftransVers'ely-movfable frame carrying avertical w-ire, a threaded stud and a pointer, springs connecting' said movable frame with said body, a fixed scale cooperating with-said pointer,.a micrometernut mountedupon said stud andcoperating with said scale, substantially as specified.

4. In a telescopicA gun-sight, a deflection finder consisting of abody, a fixed frame carrying a horizontal wire, a transversely-movable frame carrying a vertical wire,.a threaded stud andv a pointer, spiral springs carried'in recesses in said movable frame connectedt-'o said body, a fixed scale cooperating with said jpointer, a micrometer-nut on said' stud having two scales; either of' which may cooperate with said fixed scale, substantially as speciified.

In testimony whereof Iv hereunto affix my lsignature inthe presence of two witnesses.

AMBROSE SWASEY.

lVitnesses:

WM. E. REED, P. E. KNowLToN. 

